<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .login-box{
            margin: 50px;
        }
        .login-box .title{
            font-weight: bold;
            line-height: 80px;
            text-align: center;
        }
        .login-box .block{
            margin: 30px 0;
        }
        .login-box .block input{
            height: 40px;
            padding-left: 20px;
            border: 1px solid #ccc;
            border-radius: 5px;
            width: 100%;
            outline: none;
            box-sizing: border-box;
        }
        

    </style>
</head>
<div class="login-box">
    <div class="title">登录页</div>
    <div class="block">
        <input type="text" placeholder="输入用户名">
    </div>
    <div class="block">
        <input type="password" placeholder="输入密码">
    </div>
    <div class="block">
        <input type="button" value="登陆">
    </div>
</div>
<body>
    <script src="./ajax.js"></script>
    <script>

        //获取三个input输入框
        var inputs = document.querySelectorAll('.login-box .block input');
        //给button绑定点击事件
        inputs[2].onclick = function(){
            //对表单内容做校验( 为空校验, 格式校验 )
            if( inputs[0].value && inputs[1].value ){
                if(/^\d{4}$/.test(inputs[1].value) ){
                    //通过校验, 发起登陆请求
                    ajax('get','./07-data.json' , {} , function(data){
                        //遍历返回的数组,判断是否存在该用户
                        var index = data.findIndex((item)=>{
                            return item.username ==  inputs[0].value && 
                            item.password == inputs[1].value;
                        })
                        if( index != -1 ){
                            alert('登陆成功!')
                        }else{
                            alert('登陆失败!')
                        }
                    })
                }else{
                    alert('请输入正确的手机号/密码')
                }
            }else{
                alert('用户名/密码不能为空!')
            }
        }

    </script>
</body>
</html>